Air-heating stove



(NO Mod el.)

L. P. CONVERSE. AIR HEATING STOVE.

No. 498,460; Patented May 30, 1893.

'l r' I l H l W Ll; G 7 0' L] t I I W il 7 E S AT PATENT OFFICE.

LYMAN P. CONVERSE, OF CHICAGO, ILLINOIS.

AIR-H EATING STOVE.

SPECIFICATION forming part of Letters Patent No. 498,460, dated May 30,1893. Application filed April 5 1892. Serial No. 427,859. (No model.)

To all whom it may concern.-

Be it knownthat I, LYMAN P. CONVERSE, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Air-Heating Stoves, of whichthe following is a specification.

My invention relates to an improvement in air heating stoves of the kindespecially adapted for domestic use, and is more particularly directedto increasing the capacity of the apparatus and the simplicity of thearrangement of parts.

The object of my invention is, further- .more, to effect an improvementin the capabilities'of stoves of this nature to produce substantiallycomplete combustion of bituminous coal, and also to provide forobtaining a centrally located discharge of the products of combustionwith a chimney extend-- ing out of one side of the stove.

To these ends my invention consists in the general and specificdetailsof construction hereinafter fully set forth and claimed.

In the drawing is illustrated in vertical, central sectional elevation aheating stove provided with my improvements.

A represents the base of the stove, upon which is supported the ash-pitB having a door if. The ash-pit is divided into two chambers by a wall8, the chamber '1' thus afforded between the partition wall and theouter wall continuing around the ash-pit and terminating at each end atthe door. At suitable points the base of the chamber r is perfo-. ratedto provide air openings, as indicated at r. Upon the ash-pit issupported a fire-box C formed with a double wall D D in a single castingto produce a chamber E. The walls D converge downward to the grate F,the base E of the chamber being perforated to provide air openings qcorresponding with the opening r and the outer wall D is also perforatedas indicated at g to afford openings controlled by a damper g leadingdirectly from the chamber E to the outer air.

The grate F is in the form of a cone, the point of which is aconsiderable distance above the base. 7 When the fuel is introduced itwill thus be sustained in a manner to cause the combustion to take placein an outward as well as a vertical direction, thereby preward the wallof the fire-box remains unconsumed. t

G represents the combustion chamber which surmounts the fire-box C, andin this chamber the door G"'is provided as usual. Near the base of thecombustion chamber .G the wall thereof is provided with a series ofapertures 17, which may be controlled by-a damper p, the purpose of saidapertures being to admit air to the combustion chamber immediately abovethe fire-box to assist the perfect combustion of bituminous coal whenthe same shall be used. When anthracite coal is being burned theapertures 19 will be closed, as opening them would have a tendencytobank the fire. The combustion cham ber G is surmounted bya chamberH,the base H of which carries upward extending sectional rings 1 of thekind described and claimed in Letters Patent of the United States, No.336,892, granted to me February 16, 1886.

venting the common and objectionable burn ing of the fuel in the middlewhile that 130- The function of the projections I is to afford anincreased heating surface, they receiving heat from the combustionchamber G and affording a circuitous passage for air entering thechamber H at the outer edges and passing towardthe central outlet K.Pipes L, which may be four in number, two being shown in the sectionalview of the figure, lead from the chamber E, with the upper end of whichthey communicate, to the chamber H, with which they communicate near thecircumference. The pipes L convey the air which enters the chamber Ethrough the openings q and q to the'surmounting heating chamber H, theair becoming partly heated in the upward passage and more thoroughlyheated in the passage through the chamber H to the flue K, whence it maybe withdrawn for use.

It is quite apparentthat the products of combustion may be abstracted inany of the usual ways, as by a chimney located within the flue K andopening into the combustion chamber, or by a chimney withdrawing theproducts of combustion at the side of the stove; but I prefer to employa chimney which, while permitting a central draft, as in the first-namedstructure suggested, shall pass from the combustion chamber at the sidethereof, as in the last-named. For this purpose I provide in the wall ofthe chamber a double annular flange o, one-half of which projects intothe combustion chamber to receive the elbowed pipe M terminating in theflaring upward extending mouth n, the upper extremity of which is alittle below the top of the combustion chamber, the other half of theflange affording means for securing the pipe M for conveying theproducts of combustion away from thestove. From this construction itwill appear that the products of combustion are drawn upward by acentral draft and are directed against the base of the heating chamber Hbefore their Withdrawal from the stove, thus permitting the full benefitof the products of combustion for heating the air to be obtained.

As will be observed on an examination of the figure the top plate H ofthe combustion chamber is made substantially cone-shaped,

that is to say, the center is raised higher than the lateral edges. Bythis arrangement the products of combustion are caused in their upwardmovement to pass along the base of the upperheating chamber and collectat the central point immediately above the chimney opening. In thismanner the effect of the draft through the chimney is to cause adirection of the heat product against the air heating surface, and atthe same time the arrangement of the plate H is such as to direct theproducts of combustion into the chimney outlet, and hence serves toassist combustion by increasing the readiness of the withdrawal of theproducts thereof.

What I claim as new, and desire to secure by Letters Patent, is-

In a heating stove, the combination with the fire box containing a grateand a combustion chamber, of an air heating chamber E surrounding thetire box and formed therewith in a single casting, and having airinletsin its base portion and air outlets in its upper end, a plate Hconcave on its under side and forming the base of a hot air chamber H,pipes L leading from the chamber Eto the chamber H through thecombustion chamb er, between the walls of which and the said pipes spaceis afforded for the passage of the products of combustion, and thechimney M M, leading from a point in the combustion chamber below theraised center of the plate H, substantially as described.

- LYMAN P. CONVERSE. In presence of-- J. N. HANSON, M. J. FROST.

